Collecting device for dynamo-electric machines.



H. H. RALSTON.

COLLECTING DEVICE FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED MAY 24, 1907.

Patented Feb-6, 1912.

M M Y w m UNITED STATES PATENT OFFICE- HOWARD I-I. RALSTON, OF NORWOOD,OHIO, ASSIGNOIR TO ALLIS-CHALMERS COMPANY, A CORPORATION OF NEW JERSEY,AND THE BULLOCK ELECTRIC MANUFACTURING COMPANY, A CORPORATION OF OHIO.

COLLECTING DEVICE FOR DYNAMIC-ELECTRIC MACHINES.

To all whom it may concern Be it known that I, HowAnn H. B-ALsToN, acitizen of the United States, residing at Norwood, in the county ofHamilton and State of Ohio, have invented certain new and usefulImprovements in Collecting Devices for Dynamo-Electric Machines, ofwhich the following is a full, clear, and exact specification.

My invention relates to collecting devices for dynamo-electric machines,and the object is to provide means whereby the pressure of the brush onthe commutator or collector ring may be readily adjusted.

Vith this object in view my invention comprises certain novel featureswhich will appear from the description and drawings and will beparticularly pointed out in the claims.

Figure 1 is an isometric view of a brush holder and a fragment of acommutator,

showing one embodiment of my invention. Figs. 2, 3, 1 and 5 arefragmentary views showing the spring-adjusting device in differentpositions; and Fig. 6 is an isometric view of a modified form ofspring-adjusting device.

The main body 10 of the brush holder is provided with a hole 11, wherebyit may be fastened upon a brush stud of any desired or usual character.The brush 12 is held in engagement with the commutator or collectingring 13 by a spring-pressed lever 14, the fulcrum end of which is forkedto form two notched arms 15 and 16. One end of a spring 17 is attachedto the body of the brush holder at 18, while the other end fits over arod 19 carried by a spring-adjusting device 20, which in turn rests incorresponding notches in the arms 15 and 16. This springadjusting devicein its preferred form is made of a single punching of sheet metal, whichis bent into the shape shown in the drawings.

In Fig. 2 the spring-adjusting device 20 is shown in full and dottedlines respectively in the two normal positions which it may have in onepair of notches on the arms 15 and 16. By pressing the upper end 21 ofthe spring-adjusting device 20 to the right through the position shownin Fig. 3 to that shown in Fig. 4:, the hooks 22 on the supporting partsof said device are caused to extend over the teeth formed between thenotches in which the device at first rested Specification of LettersPatent.

Patented Feb. 6, 1912.

Application filed May 24, 1907. Serial NO. 375,391.

and the notches adjacent thereto on the left. By now releasing the end21 the spring 16 draws the device 20 back into a position correspondingto that shown in Fig. 2, but resting in the next pair of notches to theleft. Thus the spring is so moved that it exerts a greater pressure onthe brush 12 than before By repeating this operation as many times asdesired, the spring-adjusting device 20 may be moved to the left to anydesired pair of notches. By pressing the upper end 21 to the left, asshown in Fig. 5, the spring-adjusting device may be similarly moved fromany pair of notches to the next pair on the right to decrease thepressure of the spring on the brush. By repeating this latter operationas many times as necessary the spring-adjusting device may be moved tothe right to any desired pair of notches. The rod 19 is arranged toslide from one corner to the other of the spring-adjusting device sothat the spring will not require to be stretched so much when adjustingit as would be the case if the rod could not so slide.

In Fig. 6 is shown a modification of a spring-adjusting device in whichit is made of cast metal instead of a punching of sheet metal. Here thespring 17 passes through a slot 25 in the device itself instead offitting 'over a rod 19 as in the other modification. The operation ofthis modification is substantially the same as that above described forthe sheet metal structure.

Many modifications in the precise arrangements shown and described maybe made without departing from the spirit and scope of my invention, andall such I aim to cover in the following claims.

What I claim as new is 1. In a collecting device for dynamo-electricmachines, the combination of a brush, a notched lever engaging saidbrush, a spring, a tiltable device through which the force of the springis transmitted to the lever, said device having a fulcrum which engagesa notch of said lever, and said fulcrum having a projection whichprojects into the next notch in one direction when the tiltable de viceis tilted in the other direction and throws the fulcrum into said nextnotch when the tiltable device is released.

2. In a collecting device for dynamo-electric machines, the combinationof a brush, a notched lever engaging said brush, a spring,

a tiltable device through which the force of the spring is transmittedto the lever, said device having a fulcrum which engages a notch of saidlever, and saidfulcrum having a projection which projects into the nextnotch in either direction when the tiltable device is tilted in theother direction and throws the fulcrum into said next notch when thetiltable device is released.

3. In a collecting device for dynamoelectric machines, the combinationof a brush, a notched lever engaging said brush, a spring, a tiltabledevice through which the force of the spring is transmitted to thelever, said device having a fulcrum which engages a notch of said lever,and said fulcrum having a projection which projects into the next notchwhen the tiltable device is tilted and. throws the fulcrum into saidnext notch when the tiltable device is released.

4. In a collecting device for dynamoelectric machines, the combinationof a brush, a notched member, a tiltable device having a fulcrum whichengages a notch in said member, and a spring engaging said tiltabledevice and acting on said brush, said spring tending to keep saidtiltable device substantially upright relatively to said notched member,and the fulcrum of said tiltable device having a projection whichprojects into the next notch in one direction when the tiltable deviceis tilted in the other direction and acts as a pivot for the spring tothrow said fulcrum into said next notch when the tiltable device isreleased.

5. In a collecting device for dynamoelectric machines, the combinationof a brush, a notched member, a tiltable device having a fulcrum whichengages a notch in said member, and a spring engaging said tiltabledevice and acting on said brush, said spring tending to keep saidtiltable device substantially upright relatively to said notched member,and the fulcrum of said tiltable device having a projection whichprojects into the next notch in either direction when the tiltabledevice is tilted in the other direct-ion and acts as a pivot for thespring to throw said fulcrum into said next notch when the tiltabledevice is released.

6. I11 a collecting device for dynamoelectric machines, the combinationof a brush, a notched member, a tiltable device having a fulcrum whichengages a notch in said member, and a spring engaging said tiltabledevice and acting on said brush, said spring tending to keep saidtiltable device substantially upright relatively to said notched member,and the fulcrum of said tiltable device having a projection whichprojects into the next notch when the tiltable device is tilted and actsas a pivot for the spring to throw said fulcrum into said next notchwhen the tiltable device is released.

7. In a collecting device for dynamoelectric machines, the combinationof a brush, a notched member, a tiltable device having a fulcrum whichengages a notch in said member, and a spring engaging said tiltabledevice and acting on said brush, said spring tending to keep saidtiltable device substantially upright relatively to said notched memberand acting on said notched member with a force which has a negligiblecomponent lengthwise of the notched member, and the fulcrum of saidtiltable device having a projection which projects into the next notchin one direction when the tiltable device is tilted in the otherdirection and acts as a pivot for the spring to throw said fulcrum intosaid next notch when the tiltable device is released.

8. In a collecting device for dynamoelectric machines, the combinationof a brush, a notched member, a tiltable device having a fulcrum whichengages a notch in said member, and a spring engaging said tiltabledevice and acting on said brush, said spring tending to keep saidtiltable device substantially upright relatively to said notched memberand acting on said notched 'member with a force which has a negligiblecomponent lengthwise of the notched member, and the fulcrum of saidtiltable device having a projection which projects into the next notchin either direction when the tiltable device is tilted in the otherdirection and acts as a pivot for the spring to throw said fulcrum intosaid next notch when the tiltable device is released.

9. In a collecting device for dynamoelectric machines, the combinationof a brush, a notched member, a tiltable device having a fulcrum whichengages a notch in said member, and a spring engaging said tiltabledevice and acting on said brush, said spring tending to keep saidtiltable device substantially upright relatively to said notched memberand acting on said notched member with a force which has a negligiblecomponent lengthwise of the notched member, and the fulcrum of saidtiltable device having a projection which projects into the next notchwhen the tiltable device is tilted and acts as a pivot for the spring tothrow said fulcrum into said next notch when the tiltable device isreleased.

In testimony whereof I afiix my signature, in the presence of twowitnesses.

HOlVAR-D H. RALSTON.

Witnesses:

GEO. B. SoHLEY, FRED J. KINsEY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

